[python] LineRequest.reconfigure_lines problems about libgpiod

[brgl]

Hi! Can you try the following patch?

Scratch that. Actually it doesn't make sense. The order in which settings are added affects the order of offsets in the resulting request. This bit is missing from python docs but the core C library mentions it:

When calling ::gpiod_chip_request_lines, the library will request all
offsets that were assigned settings in the order that they were assigned.
If any of the offsets was duplicated, the last one will take precedence.

[dex6]

Yeah, that patch does not make sense; and it makes things even worse. In my case 4 lines initially have identical configuration, so my request dict actually mixes integer and tuple keys. But unlike py2, python 3 loudly refuses to sort objects of different types... So the only way would probably require sorting resulting _ext.LineConfig that goes to the C library/kernel, but that probably will break other things. Agreed improving docs is best what can be done in gpiod here.

I'll switch my script to integer-keys-only dicts, sorted before passing to gpiod. Hmm... Leaving original request_lines config dict around, and then updating it in-place before passing again to reconfigure_lines, also seems like a possible option.

Thanks for quick help and your work on the gpiod library!